ΔE 11.5, fair: the same colour family, but not a straight swap. Tallarn Sand is noticeably darker than Tan Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Tallarn Sand is noticeably darker than Tan Yellow.
The same difference applies the other way round: Tan Yellow is noticeably lighter.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Tan Yellow on the colour wheel See Tallarn Sand on the colour wheel
All matches: Tan Yellow equivalents · Tallarn Sand equivalents